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The Levytator is a free-form escalator that can bend and curve as needed by architects. It operates on one continuous loop, so there's no need for redundant conveyors moving in opposite directions:

Unlike traditional designs, where redundant steps move underneath those in use, the Levytator utilises a continuous loop of curved modules, which can follow any path upwards, flatten and straighten out, and descend once more, all with passengers onboard.

The system can be arranged in any configuration – as a DNA-esque double helix in a science museum, for example – and also offers several practical advantages at a cost that is similar to a conventional unit.

Link via Geekosystem